quote:Since last summer, the Texas group Defense Distributed has been working to make the idea of home 3D printing of gun components and possibly even entire firearms into a reality. They’ve succeeded, at least, for one man: New York representative Steve Israel, who sees the possibility as real enough that it needs to be explicitly banned in law. After Defense Distributed’s YouTube tests of partially 3D printed semiautomatic weapons, Israel promised last month to specifically ban 3D printed gun components in his proposed renewal of the Undetectable Firearms Act, a law intended to ban the possession of any weapon that can’t be spotted by a metal detector or X-ray machine. And when Defense Distributed demonstrated a 3D printed high-capacity magazine–the exact ammunition feeding devices that would be banned for sale under a new federal gun control bill proposed by Congresswoman Diane Feinstein–Israel responded again, adding a specific ban on those 3D-printed ammo attachments to his proposed bill.

Can't print the primer or powder. I use to reload plastic shotgun shells but I think they had some metal inside of the plastic for the primer and such. So, I would not look for full plastic ammo in the near future. As stated above, I would think that the barrel and chamber would have to be metal but i'm not a plastics expert.